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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	13. Subsequent Event Tampa Electric Company 4.45% Notes due 2049 On October 4, 2018, TEC completed a sale of $375 million aggregate principal amount of 4.45% unsecured notes due June 15, 2049. See Note 7 for additional information.